This is a case of avenging and cornering and victimising sincere and honest employees.
Well as you aid that the fir was registered based on false and foisted complaint, your approach to quash the same before high court is a right decision.
You may proceed with the proposed quash case based on the merits in your side and can plead that this is a malicious prosecution without any base or evidence to prove their charges against you.
You can also plead that the so called temporary connections issue were already closed during January but this complaint was given based on a false information happened during June when there was no temporary connections given at that time.
In my opinion you have bright chances to get the fir quashed and even otherwise, if the case is challenged in the trial court, you may get it dismissed or acquitted.